"use strict";
console.log(1212);
function getadd(name, age) {
  if (age === void 0) {
    age = 20;
  }
  console.log(age);
  return name;
}
getadd("1");
function tsChong(str) {
  if (typeof str === "string") {
    console.log(str + "字符串");
  } else {
    console.log(str + "数字");
  }
}
tsChong(1, 1);

function ad() {}
ad.prototype.pd = function () {
  console.log(12121);
};

function dd() {}
dd.prototype = new ad();
const list = new dd();

list.pd();
